{"id":887,"date":"2023-10-19T06:59:32","date_gmt":"2022-12-18T11:44:58","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/count-%e9%96%a2%e6%95%b0%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%9f-sql-select-%e3%82%b9%e3%83%86%e3%83%bc%e3%83%88%e3%83%a1%e3%83%b3%e3%83%88\/"},"modified":"2025-08-01T03:16:51","modified_gmt":"2025-07-31T18:16:51","slug":"count-%e9%96%a2%e6%95%b0%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%9f-sql-select-%e3%82%b9%e3%83%86%e3%83%bc%e3%83%88%e3%83%a1%e3%83%b3%e3%83%88","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/count-%e9%96%a2%e6%95%b0%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%9f-sql-select-%e3%82%b9%e3%83%86%e3%83%bc%e3%83%88%e3%83%a1%e3%83%b3%e3%83%88\/","title":{"rendered":"COUNT() \u95a2\u6570\u3092\u4f7f\u7528\u3057\u305f SQL SELECT \u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8"},"content":{"rendered":"

\u307f\u306a\u3055\u3093\u3001\u3053\u3093\u306b\u3061\u306f\uff01\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001SQL SELECT\u6587\u3068COUNT()\u95a2\u6570\u306b\u7126\u70b9\u3092\u5f53\u3066\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n

\n

SQL\u306eSELECT\u6587\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h2>\n

SQL\uff08\u30a8\u30b9\u30ad\u30e5\u30fc\u30a8\u30eb\uff09\u306eSELECT\u6587\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u7279\u5b9a\u306e\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u30c7\u30fc\u30bf\u5024\u3092\u9078\u629e\u3057\u3001\u8868\u793a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n

\u69cb\u6587\uff1a<\/p>\n

SELECT<\/span> columns<\/span> \r\nFROM<\/span> Table<\/span>-<\/span>name;<\/span>\r\n<\/code><\/pre>\n
\u4f8b\u3048\u3070\uff1a<\/p>\n
The cat is sleeping.<\/p>\n
SELECT<\/span> *<\/span> from<\/span> Info;<\/span>\r\n<\/code><\/pre>\n
\u300cSELECT *\u300d\u6587\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u3059\u3079\u3066\u306e\u30c7\u30fc\u30bf\u5024\u3092\u9078\u629e\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n
\u51fa\u529b\uff1a<\/p>\n
id\tCost\tcity\r\n1<\/span>\t100<\/span>\tPune\r\n2<\/span>\t100<\/span>\tSatara\r\n3<\/span>\t65<\/span>\tPune\r\n4<\/span>\t97<\/span>\tMumbai\r\n5<\/span>\t12<\/span>\tUSA\r\n<\/code><\/pre>\n
\n
SQL\u306eCOUNT()\u95a2\u6570\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f
\n\uff08SQL\u306eCOUNT()\u95a2\u6570\u3068\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\uff1f\uff09<\/h2>\n
SQL\u306eCOUNT()\u95a2\u6570\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u5b58\u5728\u3059\u308b\u884c\u306e\u5408\u8a08\u6570\u3092\u6570\u3048\u307e\u3059\u3002<\/p>\n
\u6587\u6cd5\uff1a<\/p>\n
COUNT<\/span>(<\/span>column<\/span>-<\/span>name)<\/span>\r\n<\/code><\/pre>\n
\u4f8b\u3048\u3070:<\/p>\n
If you study hard, you will succeed.<\/p>\n
SELECT<\/span> Count<\/span>(<\/span>City)<\/span>\r\nfrom<\/span> Info;<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001\u300cInfo\u300d\u3068\u3044\u3046\u30c6\u30fc\u30d6\u30eb\u306e\u300ccity\u300d\u3068\u3044\u3046\u5217\u306e\u3059\u3079\u3066\u306e\u30c7\u30fc\u30bf\u884c\u306e\u6570\u3092\u8868\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u51fa\u529b\uff1a<\/p>\n
5<\/span>\r\n<\/code><\/pre>\n
\n
COUNT()\u95a2\u6570\u3092\u4f7f\u7528\u3057\u305fSQL SELECT\u6587\u306e\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3<\/h2>\n
\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u884c\u6570\u3092\u9078\u629e\u3057\u3066\u8868\u793a\u3059\u308b\u305f\u3081\u306b\u3001SQL\u306eSELECT\u6587\u3068COUNT()\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u306b\u52a0\u3048\u3066\u3001\u79c1\u305f\u3061\u306f\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u3067SQL SELECT\u6587\u3068COUNT()\u95a2\u6570\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
SQL\u306eSELECT COUNT()\u306e\u52d5\u4f5c\u3092\u7406\u89e3\u3057\u305f\u306e\u3067\u3001\u4eca\u5ea6\u306f\u305d\u308c\u306b\u95a2\u9023\u3059\u308b\u3055\u307e\u3056\u307e\u306a\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u306b\u3064\u3044\u3066\u4f8b\u3092\u901a\u3057\u3066\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
\n
COUNT()\u95a2\u6570\u3092\u4f7f\u7528\u3057\u305fSQL SELECT\u306e\u4f8b<\/h2>\n
SQL SELECT COUNT()\u306e\u5909\u52d5\u3092\u8868\u793a\u3059\u308b\u305f\u3081\u306b\u3001SQL CREATE\u30af\u30a8\u30ea\u3092\u4f7f\u7528\u3057\u3066\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3057\u3001SQL INSERT\u30af\u30a8\u30ea\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u3092\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u5165\u529b\u3057\u307e\u3057\u305f\u3002<\/p>\n
\u4ee5\u4e0b\u306e\u30c6\u30fc\u30d6\u30eb\u3068\u305d\u306e\u30c7\u30fc\u30bf\u306f\u3001\u4eca\u5f8c\u306e\u4f8b\u3067\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n
create<\/span> table<\/span> Info(<\/span>id integer<\/span>,<\/span> Cost integer<\/span>,<\/span> city varchar<\/span>(<\/span>200<\/span>)<\/span>)<\/span>;<\/span>\r\ninsert<\/span> into<\/span> Info(<\/span>id,<\/span> Cost,<\/span>city)<\/span> values<\/span>(<\/span>1<\/span>,<\/span> 100<\/span>,<\/span>\"Pune\"<\/span>)<\/span>;<\/span>\r\ninsert<\/span> into<\/span> Info(<\/span>id,<\/span> Cost,<\/span>city)<\/span> values<\/span>(<\/span>2<\/span>,<\/span> 100<\/span>,<\/span> \"Satara\"<\/span>)<\/span>;<\/span>\r\ninsert<\/span> into<\/span> Info(<\/span>id,<\/span> Cost,<\/span>city)<\/span> values<\/span>(<\/span>3<\/span>,<\/span> 65<\/span>,<\/span>\"Pune\"<\/span>)<\/span>;<\/span>\r\ninsert<\/span> into<\/span> Info(<\/span>id,<\/span> Cost,<\/span>city)<\/span> values<\/span>(<\/span>4<\/span>,<\/span> 97<\/span>,<\/span>\"Mumbai\"<\/span>)<\/span>;<\/span>\r\ninsert<\/span> into<\/span> Info(<\/span>id,<\/span> Cost,<\/span>city)<\/span> values<\/span>(<\/span>5<\/span>,<\/span> 12<\/span>,<\/span>\"USA\"<\/span>)<\/span>;<\/span>\r\nselect<\/span> *<\/span> from<\/span> Info;<\/span>\r\n<\/code><\/pre>\n
\u51fa\u529b:<\/p>\n
id\tCost\tcity\r\n1<\/span>\t100<\/span>\tPune\r\n2<\/span>\t100<\/span>\tSatara\r\n3<\/span>\t65<\/span>\tPune\r\n4<\/span>\t97<\/span>\tMumbai\r\n5<\/span>\t12<\/span>\tUSA e\r\n<\/code><\/pre>\n
\n
WHERE\u53e5\u3092\u4f7f\u7528\u3057\u305fSQL SELECT COUNT<\/h3>\n
SQL\u306eSELECT COUNT()\u306f\u3001SQL\u306eWHERE\u53e5\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
WHERE\u53e5\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u6761\u4ef6\u3092\u901a\u3058\u3066COUNT()\u95a2\u6570\u3068SELECT\u6587\u306b\u6e21\u3055\u308c\u308b\u30c7\u30fc\u30bf\u3092\u5236\u9650\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u79c1\u306f\u6628\u65e5\u516c\u5712\u3067\u53cb\u9054\u306b\u4f1a\u3044\u307e\u3057\u305f\u3002
\nTranslation: \u6628\u65e5\u3001\u79c1\u306f\u516c\u5712\u3067\u53cb\u9054\u3068\u51fa\u4f1a\u3044\u307e\u3057\u305f\u3002<\/p>\n
SELECT<\/span> COUNT<\/span>(<\/span>city)<\/span>\r\nFROM<\/span> Info\r\nWHERE<\/span> Cost><\/span>50<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u7d50\u679c: (1\u3064\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u307f\u5fc5\u8981)
\n\u7d50\u679c:<\/p>\n
3<\/span>\r\n<\/code><\/pre>\n
\n
2. SQL \u306e SELECT COUNT(*) \u95a2\u6570<\/h3>\n
SQL\u306eSELECT\u6587\u306f\u3001COUNT(*)\u95a2\u6570\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u30c7\u30fc\u30bf\u5024\u3092\u30ab\u30a6\u30f3\u30c8\u3057\u3066\u8868\u793a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
COUNT(*)\u95a2\u6570\u306f\u3001\u30c6\u30fc\u30d6\u30eb\u306b\u5b58\u5728\u3059\u308b\u3059\u3079\u3066\u306e\u884c\u306e\u6570\u3092\u8868\u3057\u307e\u3059\uff08NULL\u304a\u3088\u3073NON-NULL\u306e\u5024\u3092\u542b\u3080\uff09\u3002<\/p>\n
\u65e5\u672c\u306e\u6587\u5316\u306b\u306f\u4f1d\u7d71\u7684\u306a\u8981\u7d20\u304c\u3042\u308a\u307e\u3059\u3002
\n(There are traditional elements in Japanese culture.)<\/p>\n
SELECT<\/span> COUNT<\/span>(<\/span>*<\/span>)<\/span>\r\nFROM<\/span> Info;<\/span>\r\n<\/code><\/pre>\n
\u51fa\u529b\uff1a<\/p>\n
5<\/span>\r\n<\/code><\/pre>\n
\n
3. DISTINCT\u53e5\u3092\u4f7f\u7528\u3057\u305fSQL SELECT COUNT\u3092\u5b9f\u884c\u3059\u308b\u3002<\/h3>\n
DISTINCT\u53e5\u306f\u5197\u9577\u306a\u30c7\u30fc\u30bf\u3092\u9664\u5916\u3057\u3001\u9078\u629e\u3057\u305f\u5217\u304b\u3089\u306f\u30e6\u30cb\u30fc\u30af\u306a\u5024\u306e\u307f\u3092\u8868\u793a\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n
SQL\u306eSELECT COUNT()\u95a2\u6570\u306f\u3001DISTINCT\u53e5\u3068\u4e00\u7dd2\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u4e00\u610f\u306e\uff08\u7e70\u308a\u8fd4\u3057\u306e\u306a\u3044\uff09\u5024\u3092\u8868\u3059\u884c\u306e\u6570\u3092\u30ab\u30a6\u30f3\u30c8\u3057\u3066\u8868\u793a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u3092\u65e5\u672c\u8a9e\u3067\u8a00\u3044\u63db\u3048\u3066\u304f\u3060\u3055\u3044\uff08\u65e5\u672c\u8a9e\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u307f\u5fc5\u8981\u3067\u3059\uff09\uff1a
\n\u4f8b\uff1a<\/p>\n
SELECT<\/span> COUNT<\/span>(<\/span>DISTINCT<\/span> Cost)<\/span>\r\nFROM<\/span> Info;<\/span>\r\n<\/code><\/pre>\n
\u51fa\u529b:<\/p>\n
4<\/span>\r\n<\/code><\/pre>\n
\n
4. \u96c6\u8a08\u3068GROUP BY\u53e5\u3092\u4f7f\u7528\u3057\u305fHAVING\u3092\u542b\u3080SQL SELECT COUNT\u6587<\/h3>\n
SQL\u306eSELECT COUNT()\u95a2\u6570\u306f\u3001\u30c7\u30fc\u30bf\u306e\u9078\u629e\u524d\u306b\u6761\u4ef6\u3092\u8ffd\u52a0\u3057\u305f\u308a\u3001\u7279\u5b9a\u306e\u5217\u306e\u5024\u3067\u30c7\u30fc\u30bf\u884c\u3092\u30b0\u30eb\u30fc\u30d7\u5316\u3057\u305f\u308a\u3059\u308b\u305f\u3081\u306b\u3001GROUP BY\u304a\u3088\u3073HAVING\u53e5\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
Example:<\/p>\n
\u5143\u6c17\u306a\u671d\u306e\u4f53\u64cd\u306f\u3001\u79c1\u306e\u4e00\u65e5\u306e\u30d1\u30ef\u30d5\u30eb\u306a\u59cb\u307e\u308a\u3067\u3059\u3002<\/p>\n
SELECT<\/span> city,<\/span> COUNT<\/span>(<\/span>Cost)<\/span>\r\nFROM<\/span> Info\r\nGROUP<\/span> BY<\/span> city\r\nHAVING<\/span> COUNT<\/span>(<\/span>Cost)<\/span>><\/span>1<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u51fa\u529b\uff1a<\/p>\n
city\tCOUNT<\/span>(<\/span>Cost)<\/span>\r\nPune\t2<\/span>\r\n<\/code><\/pre>\n
\n
\u7d50\u8ad6<\/h2>\n
\u3053\u308c\u306b\u3088\u308a\u3001\u3053\u306e\u30c8\u30d4\u30c3\u30af\u306f\u7d42\u4e86\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u3082\u3057\u7591\u554f\u304c\u751f\u3058\u305f\u5834\u5408\u306f\u3001\u30b3\u30e1\u30f3\u30c8\u6b04\u3067\u81ea\u7531\u306b\u30b3\u30e1\u30f3\u30c8\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
SQL\u306b\u95a2\u9023\u3059\u308b\u3053\u306e\u3088\u3046\u306a\u6295\u7a3f\u306b\u3064\u3044\u3066\u306f\u3001\u305c\u3072SQL JournalDev\u3092\u8a2a\u308c\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\n
\u53c2\u8003\u6587\u732e<\/h2>\n
    \n
  • SQL COUNT() function \u2013 Documentation<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
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